<?php


//跳转接口 des 加密类
    class CookieCrypt   
    {     
        var $key;  
        function CookieCrypt($key)   
        {         
        $this->key = $key;  
        }         
        function encrypt($input)   
       {         
          $size = mcrypt_get_block_size('des','ecb');  
          $input = $this->pkcs5_pad($input, $size);  
         $key = $this->key;  
          $td = mcrypt_module_open('des', '', 'ecb', '');  
          $iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);  
         @mcrypt_generic_init($td, $key, $iv);  
          $data = mcrypt_generic($td, $input);  
          mcrypt_generic_deinit($td);  
         mcrypt_module_close($td);  
         $data = base64_encode($data);  
         return $data;  
       }         
       function decrypt($encrypted)  
       {         
          $encrypted = base64_decode($encrypted);  
         $key =$this->key;  
          $td = mcrypt_module_open('des','','ecb','');   
          //使用MCRYPT_DES算法,cbc模式  
          $iv = @mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);  
          $ks = mcrypt_enc_get_key_size($td);  
          @mcrypt_generic_init($td, $key, $iv);  
          //初始处理                 
          $decrypted = mdecrypt_generic($td, $encrypted);  
         //解密  
          mcrypt_generic_deinit($td);  
          //结束               
          mcrypt_module_close($td);  
         $y=$this->pkcs5_unpad($decrypted);  
         return $y;     
       }         
      function pkcs5_pad ($text, $blocksize)   
      {         
         $pad = $blocksize - (strlen($text) % $blocksize);  
          return $text . str_repeat(chr($pad), $pad);  
       }     
       function pkcs5_unpad($text)   
       {         
          $pad = ord($text{strlen($text)-1});  
          if ($pad > strlen($text))  
        {  
            return false;  
        }  
          if (strspn($text, chr($pad), strlen($text) - $pad) != $pad)  
         {  
           return false;  
        }  
          return substr($text, 0, -1 * $pad);  
      }  
   }   
   